Killing game at long distances and having to dope the wind doesn't add up to clean consistent kills. The type of terrain, wind direction, speed and consistency can and will push your point of impact all over the place.
That's hunting. There are lots of variables in the field that make clean kills an imperfect science, whether shooting at short distance or long, such as moving game, unpredictable animal movements, etc.
It's certainly true that if you haven't practiced enough to be able to judge the wind and place your bullet with accuracy, in addition to learning about animal behaviour so you can determine when an animal is most likely to stay stationary, you should avoid shooting game at long distance.
